Is depression related to hypertension and diabetes?

Both the answers are satisfactory

My mum had suffered from depression for years then hypertension then diabetes NOW dementia? I guess they are all related in some way,if you are deporessed you are not going to look after yourself properly so your health gets worse!

No. Depression is a totally separate illness. Someone in my family had depression long before they became a diabetic, and then later acquired hypertension. But someone could be mildly depressed and become more depressed after discovering they have diabetes or hypertension - but it's not the cause of them being depressed. Hope this helps!